Viewer.js

JavaScript image viewer.

• Website

Table of contents

• Features
• Main
• Getting started
• Keyboard support
• Options
• Methods
• Events
• No conflict
• Browser support
• Contributing
• Versioning
• License

Features

• Supports 29 options
• Supports 23 methods
• Supports 7 events
• Supports modal and inline modes
• Supports touch
• Supports move
• Supports zoom
• Supports rotation
• Supports scale (flip)
• Supports keyboard
• Cross-browser support

Main

dist/
├── viewer.css     ( 8 KB)
├── viewer.min.css ( 7 KB)
├── viewer.js      (61 KB)
└── viewer.min.js  (23 KB)

Getting started

Quick start

Three quick start options are available:

• Download the latest release.
• Clone the repository: git clone https://github.com/fengyuanchen/viewerjs.git.
• Install with NPM: npm install viewerjs.

Installation

Include files:

<link  href="/path/to/viewer.css" rel="stylesheet">
<script src="/path/to/viewer.js"></script>

Usage

Initialize with Viewer constructor:

• Browser: window.Viewer
• CommonJS: var Viewer = require('viewer')
• NodeJS: var Viewer = require('viewerjs')(window)

<!-- a block container is required -->
<div>
  <img id="image" src="picture.jpg" alt="Picture">
</div>

<div>
  <ul id="images">
    <li><img src="picture.jpg" alt="Picture"></li>
    <li><img src="picture-2.jpg" alt="Picture 2"></li>
    <li><img src="picture-3.jpg" alt="Picture 3"></li>
  </ul>
</div>

// View one image
var viewer = new Viewer(document.getElementById('image'), options);

// View some images
var viewer = new Viewer(document.getElementById('images'), options);

Keyboard support

Only available in modal mode.

• Esc: Exit full screen or stop play.
• Space: Stop play.
• ←: View the previous image.
• →: View the next image.
• ↑: Zoom in the image.
• ↓: Zoom out the image.
• Ctrl + 0: Zoom out to initial size.
• Ctrl + 1: Zoom in to natural size.

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Options

You may set viewer options with new Viewer(image, options). If you want to change the global default options, You may use Viewer.setDefaults(options).

inline

• Type: Boolean
• Default: false

Enable inline mode.

button

• Type: Boolean
• Default: true

Show the button on the top-right of the viewer.

navbar

• Type: Boolean or Number
• Default: true
• Options:
  • 0 or false: hide the navbar
  • 1 or true: show the navbar
  • 2: show the navbar only when screen width great then 768 pixels
  • 3: show the navbar only when screen width great then 992 pixels
  • 4: show the navbar only when screen width great then 1200 pixels

Specify the visibility of the navbar.

title

• Type: Boolean or Number
• Default: true
• Options:
  • 0 or false: hide the title
  • 1 or true: show the title
  • 2: show the title only when screen width great then 768 pixels
  • 3: show the title only when screen width great then 992 pixels
  • 4: show the title only when screen width great then 1200 pixels

Specify the visibility of the title (the current image's name and dimensions).

The name comes from the alt attribute of an image element or the image name parsed from URL.

toolbar

• Type: Boolean or Number
• Default: true
• Options:
  • 0 or false: hide the toolbar
  • 1 or true: show the toolbar
  • 2: show the toolbar only when screen width great then 768 pixels
  • 3: show the toolbar only when screen width great then 992 pixels
  • 4: show the toolbar only when screen width great then 1200 pixels

Specify the visibility of the toolbar.

tooltip

• Type: Boolean
• Default: true

Show the tooltip with image ratio (percentage) when zoom in or zoom out

movable

• Type: Boolean
• Default: true

Enable to move the image.

zoomable

• Type: Boolean
• Default: true

Enable to zoom the image.

rotatable

• Type: Boolean
• Default: true

Enable to rotate the image.

scalable

• Type: Boolean
• Default: true

Enable to scale the image.

transition

• Type: Boolean
• Default: true

Enable CSS3 Transition for some special elements.

fullscreen

• Type: Boolean
• Default: true

Enable to request full screen when play.

Requires the browser supports Full Screen API.

keyboard

• Type: Boolean
• Default: true

Enable keyboard support.

interval

• Type: Number
• Default: 5000

Define interval of each image when playing.

minWidth

• Type: Number
• Default: 200

Define the minimum width of the viewer.

Only available in inline mode (set the inline option to true).

minHeight

• Type: Number
• Default: 100

Define the minimum height of the viewer.

Only available in inline mode (set the inline option to true).

zoomRatio

• Type: Number
• Default: 0.1

Define the ratio when zoom the image by wheeling mouse.

minZoomRatio

• Type: Number
• Default: 0.01

Define the min ratio of the image when zoom out.

maxZoomRatio

• Type: Number
• Default: 100

Define the max ratio of the image when zoom in.

zIndex

• Type: Number
• Default: 2015

Define the CSS z-index value of viewer in modal mode.

zIndexInline

• Type: Number
• Default: 0

Define the CSS z-index value of viewer in inline mode.

url

• Type: String or Function
• Default: 'src'

Define where to get the original image URL for viewing.

If it is a string, it should be one of the attributes of each image element. If it is a function, it will be called on each image and should return a valid image URL.

ready

• Type: Function
• Default: null

A shortcut of the ready event.

show

• Type: Function
• Default: null

A shortcut of the show event.

shown

• Type: Function
• Default: null

A shortcut of the shown event.

hide

• Type: Function
• Default: null

A shortcut of the hide event.

hidden

• Type: Function
• Default: null

A shortcut of the hidden event.

view

• Type: Function
• Default: null

A shortcut of the view event.

viewed

• Type: Function
• Default: null

A shortcut of the viewed event.

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Methods

All methods allow chain composition.

As there are some asynchronous processes when start the viewer, you should call a method only when it is available, see the following lifecycle:

new Viewer(image, {
  ready: function () {
    // 2 methods are available here: "show" and "destroy".
  },
  shown: function () {
    // 9 methods are available here: "hide", "view", "prev", "next", "play", "stop", "full", "exit" and "destroy".
  },
  viewed: function () {
    // All methods are available here except "show".
    this.viewer.zoomTo(1).rotateTo(180);
  }
});

show()

Show the viewer.

Only available in modal mode.

hide()

hide the viewer.

Only available in modal mode.

view([index])

• index (optional):
  • Type: Number
  • Default: 0
  • The index of the image for viewing

View one of the images with image's index.

viewer.view(1); // View the second image

prev()

View the previous image.

next()

View the next image.

move(offsetX[, offsetY])

• offsetX:

  • Type: Number
  • Moving size (px) in the horizontal direction

• offsetY (optional):

  • Type: Number
  • Moving size (px) in the vertical direction.
  • If not present, its default value is offsetX

Move the image with relative offsets.

viewer.move(1);
viewer.move(-1, 0); // Move left
viewer.move(1, 0);  // Move right
viewer.move(0, -1); // Move up
viewer.move(0, 1);  // Move down

moveTo(x[, y])

• x:

  • Type: Number
  • The left value of the image

• y (optional):

  • Type: Number
  • The top value of the image
  • If not present, its default value is x.

Move the image to an absolute point.

zoom(ratio[, hasTooltip])

• ratio:

  • Type: Number
  • Zoom in: requires a positive number (ratio > 0)
  • Zoom out: requires a negative number (ratio < 0)

• hasTooltip (optional):

  • Type: Boolean
  • Default: false
  • Show tooltip

Zoom the image with a relative ratio

viewer.zoom(0.1);
viewer.zoom(-0.1);

zoomTo(ratio[, hasTooltip])

• ratio:

  • Type: Number
  • Requires a positive number (ratio > 0)

• hasTooltip (optional):

  • Type: Boolean
  • Default: false
  • Show tooltip

Zoom the image to an absolute ratio.

viewer.zoomTo(0); // Zoom to zero size (0%)
viewer.zoomTo(1); // Zoom to natural size (100%)

rotate(degree)

• degree:
  • Type: Number
  • Rotate right: requires a positive number (degree > 0)
  • Rotate left: requires a negative number (degree < 0)

Rotate the image with a relative degree.

viewer.rotate(90);
viewer.rotate(-90);

rotateTo(degree)

• degree:
  • Type: Number

Rotate the image to an absolute degree.

viewer.rotateTo(0); // Reset to zero degree
viewer.rotateTo(360); // Rotate a full round

scale(scaleX[, scaleY])

• scaleX:

  • Type: Number
  • Default: 1
  • The scaling factor to apply on the abscissa of the image
  • When equal to 1 it does nothing.

• scaleY (optional):

  • Type: Number
  • The scaling factor to apply on the ordinate of the image
  • If not present, its default value is scaleX.

Scale the image.

viewer.scale(-1); // Flip both horizontal and vertical
viewer.scale(-1, 1); // Flip horizontal
viewer.scale(1, -1); // Flip vertical

scaleX(scaleX)

• scaleX:
  • Type: Number
  • Default: 1
  • The scaling factor to apply on the abscissa of the image
  • When equal to 1 it does nothing

Scale the abscissa of the image.

viewer.scaleX(-1); // Flip horizontal

scaleY(scaleY)

• scaleY:
  • Type: Number
  • Default: 1
  • The scaling factor to apply on the ordinate of the image
  • When equal to 1 it does nothing

Scale the ordinate of the image.

viewer.scaleY(-1); // Flip vertical

play()

Play the images.

stop()

Stop play.

full()

Enter modal mode.

Only available in inline mode.

exit()

Exit modal mode.

Only available in inline mode.

tooltip()

Show the current ratio of the image with percentage.

Requires the tooltip option set to true.

toggle()

Toggle the image size between its natural size and initial size.

reset()

Reset the image to its initial state.

update()

Update the viewer when images changed.

If you load images dynamically, you can use this method to add the new images to the viewer instance.

destroy()

Destroy the viewer and remove the instance.

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Events

All events can access the viewer instance with this.viewer in its handler.

var viewer;

image.addEventListener('viewed', function () {
  console.log(this.viewer === viewer);
  // -> true
}, false);

viewer = new Viewer(image);

ready

This event fires when a viewer instance is ready for viewing.

In modal mode, this event will not be triggered until you click on one of the images.

show

This event fires when the viewer modal starts to show.

Only available in modal mode.

shown

This event fires when the viewer modal has shown.

Only available in modal mode.

hide

This event fires when the viewer modal starts to hide.

Only available in modal mode.

hidden

This event fires when the viewer modal has hidden.

Only available in modal mode.

view

• event.detail.originalImage:

  • Type: HTMLImageElement
  • The original image.

• event.detail.index:

  • Type: Number
  • The index of the original image.

• event.detail.image:

  • Type: HTMLImageElement
  • The current image (a clone of the original image).

This event fires when a viewer starts to show (view) an image.

viewed

• event.detail: the same as the view event.

This event fires when a viewer has shown (viewed) an image.

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No conflict

If you have to use other viewer with the same namespace, just call the Viewer.noConflict static method to revert to it.

<script src="other-viewer.js"></script>
<script src="viewer.js"></script>
<script>
  Viewer.noConflict();
  // Code that uses other `Viewer` can follow here.
</script>

Browser support

• Chrome (latest)
• Firefox (latest)
• Safari (latest)
• Opera (latest)
• Edge (latest)
• Internet Explorer 9+

Contributing

Please read through our contributing guidelines.

Versioning

Maintained under the Semantic Versioning guidelines.

License

MIT © Fengyuan Chen

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